Abstract: A first and second digital rate converter device and method provides for synchronization between a first digital sample sequence and a second digital output sequence related to the first digital sample sequence for a rate converter pair (501, 511; 601, 611). The method typically utilizes at least one of: queue monitoring and zero-crossing with resetting to minimize sampling timing error.

Abstract: A novel spectral interpolation and efficient excitation codebook search method developed for a Code-Excited Linear Predictive (CELP) speech coder is set forth. The interpolation is performed on an impulse response of the spectral synthesis filter. As the result of using this new set of interpolation parameters, the computations associated with an excitation codebook search in a CELP coder are considerably reduced. Furthermore, a coder utilizing this new interpolation approach provides noticeable improvement in speech quality coded at low bit-rates.

Abstract: Apparatus for enabling a first processor to cause a second processor to effect a transfer of data between the processors in accordance with data transfer commands sent from the first processor to the second processor is described. The processors each have a program instruction memory for enabling the processors to operate independently and simultaneously when no data transfer is occurring between them, and the apparatus includes data transfer circuitry connected between the processors for enabling the data to be transferred, a program instruction decoder associated with the second processor for normally decoding and executing instructions stored in the program instruction memory of the second processor when no data transfer is occurring, and routing circuitry for carrying the data transfer commands from the first processor to the program instruction decoder for decoding to provide signals to the data transfer circuitry to effect a transfer of data.

Abstract: Measuring the programming resistor in a data jack by placing the resistor in an AC voltage divider circuit via a transformer. An AC voltage (preferably generated by the modem's own transmitter circuitry) is applied to the voltage divider circuit, and an AC voltage measurement (preferably made by the modem's A/D converter) provides the resistance of the programming resistor. Matching the low-pass filter impedance characteristic of a local loop with a network having a matching low-pass filter characteristic, while also compensating the received signal with a compensation network having a high-pass filter characteristic, to reduce the frequency dependent gain effects caused by the matching network and/or the local loop.

Abstract: A trunked communication system utilizes information on mobile unit location provided by a mobile unit to provide prioritized communication system availability. By further utilizing location information, the trunked communication system also provides a current communication system as a highest priority communication system as a mobile unit moves into a non-receiving area within an area served by the current communication system.

Abstract: An adaptive power control device and method are disclosed in which characteristics of a transfer function of a power control system are dynamically manipulated upon selective variation of a sampling rate of power control output values. Systematic monitoring of critical sampling rates allows for alternate assignment of part of a power control system workload during slower sampling frequencies. Upon determination of an operably insignificant variation of a power control system output value from a previous power control system output value, the sampling rate is decreased, enabling reallocation of a portion of the workkload of the digital power control device.

Abstract: A method and apparatus are described for processing an input value to provide an output exponential value of a desired base raised to the power of the input value. The method includes, and the apparatus included hardware for implementing, the steps of adjusting the input value relative to the input value, a predetermined base of a first exponential value, and the desired base of the output exponential value to obtain a first scaled value, modifying the scaled value to obtain an approximation value, determining the first exponential value of the approximation value, generating an adjusted error value relative to the first scaled value, the approximation value, and a logarithm of the predetermined base of the first exponential value, determining a correction value for the first exponential value and combining the first exponential value with the correction value to obtain, substantially, the output exponential value having the desired base raised to the power of the input value.

Abstract: A block-substrate dielectric filter with an a wider VHF range and better capacitive performance is set forth. A capacitive matrix situated in a dielectric substrate (102) that is operably attached to a block (104) filter provides more accurate shunt and series capacitances, and allows design of improved narrowband filters.

Abstract: An apparatus for identifying a first tone and a second tone present in a dual-tone signal, the first tone being selected from a group of tones located within a low band and the second tone being selected from a second group of tones located within a high band, the low band and the high band each spanning a frequency range no greater than f.sub.0 wide, the apparatus including a first filter for isolating and downconverting the portion of the dual-tone signal falling within the low band so that it lies within a low frequency range extending from -f.sub.0 to F.sub.0 ; and a second filter for isolating and downconverting the portion of the dual-tone signal falling within the high band so that it lies within the low frequency range.

Abstract: A communication resource method is set forth that allows communication with a subscriber unit that is in a priority access mode. Either a communication resource allocator or a subscriber unit is enabled to initiate a priority communication state in which a subscriber unit is accessible to reception of radio transmissions during the subscriber unit's priority mode status.

Abstract: A method and device are set forth for, where a linear transmitter has inphase and quadrature modulation paths for an input signal and at least one open feedback signal path is provided, substantially correcting an initial phase relationship between an input signal having an input signal vector with a phase and a magnitude, and an input feedback signal having an input feedback signal vector with a phase and a magnitude. The present invention provides a more time-efficient phase correction to at least one feedback signal path.

Abstract: Information encoded by data compression (or another data encoding technique, e.g., encryption, requiring synchronization between the encoder and decoder) is transmitted over an unreliable network by checking for transmission errors after decoding. If an error is detected, the encoder is reset, using a reset protocol which may operate over an unreliable reverse channel by using a timer to generate further reset requests when the receiver does not acknowledge them in a timely fashion.

Abstract: A trunked communication system automatic system resource acquisition method and apparatus provide for utilizing dual system resource listings to monitor for priority communications within a primary geographic communication control area. System resources on a second listing have secondary geographic coverage areas substantially within a primary geographic communication control area, allowing communication units to receive priority transmission preferentially from secondary control system resources in a first listing and secondarily from primary control system resources in a second listing when secondary control system resources are not available.

Abstract: This invention is suited for a packet network that carries bursty data. A mechanism is coupled to an edge node for coding bursty information into a digital format at either a first coding rate of a second coding rate which is less than the first rate. A mechanism senses traffic overload of one or more intermediate nodes carrying the bursty informaton. A mechanism which is responsive to the overload sensing mechanism causes the coding mechanism to switch from the first rate to the second rate while a traffic overload is sensed. Thus, network demand requirements are reduced and the overload will be alleviated.

Abstract: A reconfigurable substrate is provided for supporting electrical elements. A conductive strip is disposed on the substrate for linking at least two electrical elements. The substrate has a portion has a portion proximate to the strip for permitting subsequent removal thereof, thereby severing the conductive strip. Thus, a connection of electrical elements may be selectively varied as a function of specification of options which become operative by subsequent removal of a portion of the substrate proximate to the conductive strip.

Abstract: A method and apparatus is provided for determining the lag of a long term filter in a code excited linear prediction speech coder. An open loop lag is first determined using an autocorrelation function. The open loop lag is then utilized to generate a limited range over which a closed loop search is performed. The range for appropriate values includes lags that are harmonically related to the open loop lag as well as adjacent lags.

Abstract: A first set of plated-through holes in the printed circuit board (PCB) are covered by a protective solder mask on the solder side of the PCB while a second set of plated-through holes are exposed. Electrical components are disposed on the component side with leads inserted in the second set of holes. Solder is prevented from flowing into the first set of holes during wave soldering by the mask covering. Conductive pins designed for press fitting into the first set of holes are inserted therethrough to define connecting pins on each side of the PCB following wave soldering. This permits both a wave soldering and press fit operation to be accommodated.

Abstract: An electronic device employing controlled cold-cathode field-induced electron emission device(s) is set forth wherein controlling sources, drivers, select logic, and interconnecting lines and paths are integrated directly within a single structure.